Device for sharpening lawn-mowers.



J. P. EDWARDS. DEVICE FOR SHARPBNING LAWN MOWERS.

. APPLIUATION FILED DB0. 19, 1912.

V 1,073,412. Patented sept. 16,1913.

J; P. EDWARDS.

DEVICE FOR SHARPENING LAWN MOWERS.

APPLICATION FILED DEG. 19, 1912.

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Patented Sept. 16, 191,3.

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d P.Edwa'rds @tbm/nego erre "rfi" nr rino Joriiv P. EDWARDS, `orKiivMUNDY, ILLINOIS.

passais.

Specification of Letters Patent.

Y DEVICE rca snaarnniive LAwN-iviownns.

Patented Sept. 16, 1913.

i Application filed December 19, 1912. Serial No. 737,724.

of lllinois, liave invented certain new and 'useful Improve-ments 1nDevices for Sharpening Lawn-Mowers; and I do declarethe followng'to beafull, clear, and exact kdescription of the invention, such as willenable vothers skilled inthe art to which it appertains to make and usethe same.

rlhis invention relates to improvements in devices for sharpening lawnmowers.

One objectof the invention isto provide a sharpening device of thischaracterwhich may be readily attached to a lawn mower and which isprovided with means for adjusting the sharpening element for properlyengaging the blades of the jmachine when they are revolved.

Another object is to provide a lawn mower Sharpener which "will besimple, strong, durable and inexpensive `in construction, eiiicient andreliable in operation and well adapted to the purpose for which it isdesigned. Y

In the accompanying drawings, Figure 1 is a perspective view of a lawnmower showing my improved sharpening device applied thereto; Fig. 2 is aplan view of the same; Fig. 3 is a vertical cross sectional view throughthe lawn mower and the sharpening device showing the manner in which the.blades are engaged in the latter; Fig. 4 is a vertical longitudinalsection through the wheel and part of the frame at one end of themachine and through one of the attaching members of the sharpeningdevices; Fig. 5 is a horizontal sectional view through the sharpeningdevice removed from the mower;

Fig. 6 is a detail perspective view of the same; Fig. 7 is a similarview of one of the supporting and Vattaching plates of the sharpeningdevice.

1 My improved lawn mower Sharpener comprises pair of attaching andsupporting plates 1 which are of substantially oblong shape and in whichnear three of its outer corners are formed threaded screw holes 2 vtheirupper inner corners are obliquely disposed grooves or channels 4 whichwhen the device is applied to mowers having open worlr or skeleton sideplates, are adapted to receive one of the bars or ribs of the platesAwhereby the device is securely held in position.

ln the inner sides of the plates l near their upper ends are elongatedF-shaped recesses or-soclets 5 which are adapted to receive the ends ofthe box or casing 6 for the grinding element 7 of the device, the endsof which are engaged with the reduced portions of the recesses 5 asclearly shown in Fig. 6 of the drawing. The box or casing 6 and thegrinding element 7 are adjustably secured in the recesses 5 by inner andouter set screws 8 and 9 which are engaged with threaded apertures inthe inner and outer edges of the plates 2 as clearly shown in Figs. 6and 7 of the drawing. The grinding element 7 may be in the form of astone or may be constructed of metal or other suitable grindingmaterial.

In applying the device to the mower the attaching plates 1 are engagedwith the inner sides of the wheel frames in substantially Vthe positionsshown in Fig. 1 of the drawing wherein the outer edge of the grindingelement 7 will be in position to receive and grind the edges of theblade. When thus arranged the plates 1 are securely clamped betweenV theside, or wheel plates of the mower by the screws 3 or by any othersuitable fastening devices whereby the sharpening device will be rigidlyheld in position. After the device is thus secured to the mower the boxor casing 6 and the rinding element 7 may be adjusted inwardly oroutwardly by means of the set screws 8 and 9 to bring the grindingelement into proper position for accurately grinding the edges of t-heblades as they are revolved in the mower.

From the foregoing description taken in connection with the accompanyingdrawings, the construct-ion and operation of the invention will bereadily understood without requiring a more ,extended explanation.

Various changes inthe form,`proportion and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of the invention as claimed.

Having thus described my invention, what I claim is :V

1. A lawn mower sharpening device comprising a pair of attaching plateshaving T- shaped recesses in their inner faces, means for securing saidplates in operative position, a grinding element casing having its endsengaged with the larger portion of the recesses in said attaching`plates, a grind-- y the blades when the latter are revolved.

2. In a lawn mower sharpening device, a pair of attaching plates havingin their outer sides obliquely disposed grooves and having in theirinner sides T-shaped recesses,"gripping screws having a threadedengagement with said plates and adapted to be screwed into engagementwith the side plates of the mower whereby the sharpening device fisvrigidly secured in operative position, a grinding element casing havingY its ends engaged with the larger portion of the recesses in saidattaching plates, a grinding element carried by said casing and havtingits ends engagedwith the reduced portions o-said recesses, set screwsarranged in sai-d attaching` plates andV having their inner ends engagedwith the ends of said casing, and said grinding eleinentwhereby theseparts are adjustedand astenedin position for engaging the grindinglelement with the blades when the latterr arerevolved.

In testimony whereof I have hereunto set my hand in presence of twosubscribing-wits nesses. l V- Y l JOHN r. EDWARDS.

l/Vitnesses: g Y, p I

WILLIAM J. SPENCER, Y Josemi A'rimvsi Copies of this patent may oeobtained for five cents each,` by addressing the Commissioner of atents,

Washington, ID. C. i i i

